diff --git a/src/store/reader.rs b/src/store/reader.rs
index 388bd6cd03..a6082ac58e 100644
--- a/src/store/reader.rs
+++ b/src/store/reader.rs
@@ -81,6 +81,10 @@ impl BlockCache {
     }
 }
 
+/// Opaque cache key which indicates which documents are cached together.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct CacheKey(usize);
+
 #[derive(Debug, Default)]
 /// CacheStats for the `StoreReader`.
 pub struct CacheStats {
@@ -173,6 +177,17 @@ impl StoreReader {
         self.cache.stats()
     }
 
+    /// Returns the cache key for a given document
+    ///
+    /// These keys are opaque and are not used with the public API,
+    /// but having the same cache key means that the documents
+    /// will only require one I/O and decompression operation
+    /// when retrieve from the same store reader consecutively.
+    pub fn cache_key(&self, doc_id: DocId) -> crate::Result<CacheKey> {
+        let checkpoint = self.block_checkpoint(doc_id)?;
+        Ok(CacheKey(checkpoint.byte_range.start))
+    }
+
     /// Get checkpoint for `DocId`. The checkpoint can be used to load a block containing the
     /// document.
     ///